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Fog fever
Fog fever is a slightly confusing name. Affected animals don't have a high temperature, and the term 'fog' in the name actually refers to a second lush growth of grass, not misty or damp environmental conditions. The scientific name is Acute Bovine Pulmonary Edema (ABPE). The condition occurs in hungry, typically adult cattle, having been fed on dried feed indoors, and then moved to foggage pasture (fast growing, lush pasture, with high protein levels). The cattle graze on the new feed, clinical signs begin within 1 to 14 days and death often follows within 2 to 4 days after that. The condition can affect up to 50% of the herd, and around 30% of affected cattle may die as a result. A similar condition has been reported on a wide variety of grasses, alfalfa, rape, kale, and turnip tops.
== Clinical signs ==
The bovine experiences difficulty breathing and will do everything it can to ease this discomfort. It will try to stand with its airway as straight and extended as possible, raising its head and stretching its neck forwards. Breathing rate will increase as high as 80 breaths per minute. there may also be extension of the tongue, and drooling. The animal may grunt as it breathes and froth may form around the mouth as the condition progresses. Rectal temperature will be normal, although some may show an elevated temperature from respiratory effort.
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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